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DDoS is characterised by floods creating a DoS (in all available definitions).

But DoS can be caused by a broad range of triggers.

CVSS even has an example of a software crash classified as DoS for you:

Due to a flaw in the handler function for RPC commands, it is possible to manipulate data pointers within the Virtual Machine Executable (VMX) process. This vulnerability may allow a user in a Guest Virtual Machine to crash the VMX process resulting in a Denial of Service (DoS) on the host or potentially execute code on the host. [empasis mine]

And from Wiki:

Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. There are two general forms of DoS attacks: those that crash services and those that flood services. The most serious attacks are distributed.

So, yes, a simple crash is a DoS.

DDoS (Distributed DoS) is characterised by floods creating a DoS (in all available definitions). A single node causing a flood successfully is kind of rare.

But DoS can be caused by a broad range of triggers.

CVSS even has an example of a software crash classified as DoS for you:

Due to a flaw in the handler function for RPC commands, it is possible to manipulate data pointers within the Virtual Machine Executable (VMX) process. This vulnerability may allow a user in a Guest Virtual Machine to crash the VMX process resulting in a Denial of Service (DoS) on the host or potentially execute code on the host. [empasis mine]

And from Wiki:

Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. There are two general forms of DoS attacks: those that crash services and those that flood services. The most serious attacks are distributed.

So, yes, a simple crash is a DoS.

DDoS is characterised by floods creating a DoS.

But DoS can be caused by a broad range of triggers.

CVSS even has an example of a software crash classified as DoS for you:

Due to a flaw in the handler function for RPC commands, it is possible to manipulate data pointers within the Virtual Machine Executable (VMX) process. This vulnerability may allow a user in a Guest Virtual Machine to crash the VMX process resulting in a Denial of Service (DoS) on the host or potentially execute code on the host. [empasis mine]

And from Wiki:

Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. There are two general forms of DoS attacks: those that crash services and those that flood services. The most serious attacks are distributed.

So, yes, a simple crash is a DoS.

DDoS is characterised by floods creating a DoS (in all available definitions).

But DoS can be caused by a broad range of triggers.

CVSS even has an example of a software crash classified as DoS for you:

Due to a flaw in the handler function for RPC commands, it is possible to manipulate data pointers within the Virtual Machine Executable (VMX) process. This vulnerability may allow a user in a Guest Virtual Machine to crash the VMX process resulting in a Denial of Service (DoS) on the host or potentially execute code on the host. [empasis mine]

And from Wiki:

Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. There are two general forms of DoS attacks: those that crash services and those that flood services. The most serious attacks are distributed.

So, yes, a simple crash is a DoS.

DDoS is characterised by floods, creating a DoS. But DoS can be caused by a broad range of triggers.

CVSS even has an example for you:

Due to a flaw in the handler function for RPC commands, it is possible to manipulate data pointers within the Virtual Machine Executable (VMX) process. This vulnerability may allow a user in a Guest Virtual Machine to crash the VMX process resulting in a Denial of Service (DoS) on the host or potentially execute code on the host. [empasis mine]

So, yes, a simple crash is a DoS.

DDoS is characterised by floods creating a DoS. 

But DoS can be caused by a broad range of triggers.

CVSS even has an example of a software crash classified as DoS for you:

Due to a flaw in the handler function for RPC commands, it is possible to manipulate data pointers within the Virtual Machine Executable (VMX) process. This vulnerability may allow a user in a Guest Virtual Machine to crash the VMX process resulting in a Denial of Service (DoS) on the host or potentially execute code on the host. [empasis mine]

And from Wiki:

Denial-of-service attacks are characterized by an explicit attempt by attackers to prevent legitimate use of a service. There are two general forms of DoS attacks: those that crash services and those that flood services. The most serious attacks are distributed.

So, yes, a simple crash is a DoS.