ramjet engine vs flying drainpipe

ramjet engine and flying drainpipe both are nouns.

Word	Noun	Adjective	Verb	Adverb
ramjet engine	Yes	No	No	No
flying drainpipe	Yes	No	No	No

As nouns, ramjet engine and flying drainpipe are synonyms defined as:

ramjet engine and flying drainpipe: a simple type of jet engine; must be launched at high speed

Other synonyms of ramjet engine include atherodyde, athodyd, ramjet.

ramjet engine (noun)	flying drainpipe (noun)
a simple type of jet engine; must be launched at high speed	a simple type of jet engine; must be launched at high speed