stand by vs wait

stand by is not a noun while wait is a noun.

Word	Noun	Adjective	Verb	Adverb
stand by	No	No	Yes	No
wait	Yes	No	Yes	No

As verbs, wait is a hypernym of stand by; that is, wait is a word with a broader meaning than stand by:

stand by (noun)	wait (noun)
	the act of waiting (remaining inactive in one place while expecting something)
	time during which some action is awaited

stand by (verb)	wait (verb)
not act or do anything	look forward to the probable occurrence of
be loyal to	serve as a waiter or waitress in a restaurant
be available or ready for a certain function or service	stay in one place and anticipate or expect something
	wait before acting