tab vs tab key

tab and tab key both are nouns.

Word	Noun	Adjective	Verb	Adverb
tab	Yes	No	No	No
tab key	Yes	No	No	No

As nouns, tab and tab key are synonyms defined as:

tab and tab key: the key on a typewriter or a word processor that causes a tabulation

tab (noun)	tab key (noun)
a dose of medicine in the form of a small pellet	the key on a typewriter or a word processor that causes a tabulation
a short strip of material attached to or projecting from something in order to facilitate opening or identifying or handling it
the key on a typewriter or a word processor that causes a tabulation
the bill in a restaurant
sensationalist journalism