pinion and crown wheel vs bevel gear

pinion and crown wheel and bevel gear both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinion and crown wheel	Yes	No	No	No
bevel gear	Yes	No	No	No

As nouns, pinion and crown wheel and bevel gear are synonyms defined as:

Other synonyms of pinion and crown wheel include pinion and ring gear.

pinion and crown wheel (noun)	bevel gear (noun)
gears that mesh at an angle	gears that mesh at an angle