dumbbell vs booby

dumbbell and booby both are nouns.

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

As nouns, dumbbell and booby are synonyms defined as:

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

dumbbell (noun)	booby (noun)
an exercising weight; two spheres connected by a short bar that serves as a handle	small tropical gannet having a bright bill or bright feet or both
an ignorant or foolish person	an ignorant or foolish person