hairgrip vs bobby pin

hairgrip and bobby pin both are nouns.

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

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

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

Other synonyms of hairgrip include grip.

hairgrip (noun)	bobby pin (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