Wankel rotary engine vs Wankel engine

Wankel rotary engine and Wankel engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
Wankel rotary engine	Yes	No	No	No
Wankel engine	Yes	No	No	No

As nouns, Wankel rotary engine and Wankel engine are synonyms defined as:

Wankel rotary engine and Wankel engine: a rotary engine that is a four-stroke internal-combustion engine without reciprocating parts

Other synonyms of Wankel rotary engine include epitrochoidal engine.

Wankel rotary engine (noun)	Wankel engine (noun)
a rotary engine that is a four-stroke internal-combustion engine without reciprocating parts	a rotary engine that is a four-stroke internal-combustion engine without reciprocating parts