dumbbell vs boob

dumbbell and boob both are nouns.

Word	Noun	Adjective	Verb	Adverb
dumbbell	Yes	No	No	No
boob	Yes	No	Yes	No

As nouns, dumbbell and boob are synonyms defined as:

Other synonyms of dumbbell include booby, dope, dummy, pinhead.

dumbbell (noun)	boob (noun)
an exercising weight; two spheres connected by a short bar that serves as a handle	either of two soft fleshy milk-secreting glandular organs on the chest of a woman
an ignorant or foolish person	an ignorant or foolish person

dumbbell (verb)	boob (verb)
	commit a faux pas or a fault or make a serious mistake