sub vs attack submarine

attack submarine vs sub

sub and attack submarine both are nouns.

sub is a verb but attack submarine is not a verb.

Word	Noun	Adjective	Verb	Adverb
sub	Yes	No	Yes	No
attack submarine	Yes	No	No	No

As nouns, attack submarine is a hyponym of sub; that is, attack submarine is a word with a more specific, narrower meaning than sub:

sub: a submersible warship usually armed with torpedoes
attack submarine: a military submarine designed and armed to attack enemy shipping

Other hyponyms of sub include auxiliary research submarine, fleet ballistic missile submarine, nautilus, nuclear-powered submarine, nuclear submarine, U-boat.

sub (noun)	attack submarine (noun)
a submersible warship usually armed with torpedoes	a military submarine designed and armed to attack enemy shipping
a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States

sub (verb)	attack submarine (verb)
be a substitute

Difference between sub and attack submarine

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