bugaboo vs bugbear

bugaboo and bugbear both are nouns.

Word	Noun	Adjective	Verb	Adverb
bugaboo	Yes	No	No	No
bugbear	Yes	No	No	No

As nouns, bugaboo and bugbear are synonyms defined as:

Other synonyms of bugaboo include bogeyman, booger, boogeyman.

bugaboo (noun)	bugbear (noun)
a source of concern	an object of dread or apprehension
an imaginary monster used to frighten children	an imaginary monster used to frighten children