French telephone vs handset

French telephone and handset both are nouns.

Word	Noun	Adjective	Verb	Adverb
French telephone	Yes	No	No	No
handset	Yes	No	No	No

As nouns, French telephone and handset are synonyms defined as:

French telephone and handset: telephone set with the mouthpiece and earpiece mounted on a single handle

French telephone (noun)	handset (noun)
telephone set with the mouthpiece and earpiece mounted on a single handle	telephone set with the mouthpiece and earpiece mounted on a single handle