bobby pin vs hairgrip

bobby pin and hairgrip both are nouns.

Word	Noun	Adjective	Verb	Adverb
bobby pin	Yes	No	No	No
hairgrip	Yes	No	No	No

As nouns, bobby pin and hairgrip are synonyms defined as:

bobby pin and hairgrip: a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place

Other synonyms of bobby pin include grip.

bobby pin (noun)	hairgrip (noun)
a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place	a flat wire hairpin whose prongs press tightly together; used to hold bobbed hair in place