stab vs endeavour

stab and endeavour both are nouns.

Word	Noun	Adjective	Verb	Adverb
stab	Yes	No	Yes	No
endeavour	Yes	No	Yes	No

As nouns, endeavour is a hypernym of stab; that is, endeavour is a word with a broader meaning than stab:

stab: informal words for any attempt or effort
endeavour: earnest and conscientious activity intended to do or accomplish something

Other hypernyms of stab include attempt, effort, endeavor, try.

stab (noun)	endeavour (noun)
a strong blow with a knife or other sharp pointed instrument	earnest and conscientious activity intended to do or accomplish something
informal words for any attempt or effort	a purposeful or industrious undertaking (especially one that requires effort or boldness)
a sudden sharp feeling