floatplane vs pontoon plane

floatplane and pontoon plane both are nouns.

Word	Noun	Adjective	Verb	Adverb
floatplane	Yes	No	No	No
pontoon plane	Yes	No	No	No

As nouns, floatplane and pontoon plane are synonyms defined as:

floatplane and pontoon plane: a seaplane equipped with pontoons for landing or taking off from water

floatplane (noun)	pontoon plane (noun)
a seaplane equipped with pontoons for landing or taking off from water	a seaplane equipped with pontoons for landing or taking off from water