work bench vs lab bench

work bench and lab bench both are nouns.

Word	Noun	Adjective	Verb	Adverb
work bench	Yes	No	No	No
lab bench	Yes	No	No	No

As nouns, lab bench is a hyponym of work bench; that is, lab bench is a word with a more specific, narrower meaning than work bench:

Other hyponyms of work bench include laboratory bench, woodworking bench.

work bench (noun)	lab bench (noun)
a strong worktable for a carpenter or mechanic	a workbench in a laboratory