seaplane vs hydroplane

seaplane and hydroplane both are nouns.

Word	Noun	Adjective	Verb	Adverb
seaplane	Yes	No	Yes	No
hydroplane	Yes	No	Yes	No

As nouns, seaplane and hydroplane are synonyms defined as:

seaplane and hydroplane: an airplane that can land on or take off from water

As verbs, seaplane and hydroplane are synonyms defined as:

seaplane (noun)	hydroplane (noun)
an airplane that can land on or take off from water	an airplane that can land on or take off from water
	a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds

seaplane (verb)	hydroplane (verb)
glide on the water in a hydroplane	glide on the water in a hydroplane