iceboat vs vessel

iceboat and vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
iceboat	Yes	No	No	No
vessel	Yes	No	No	No

As nouns, vessel is a hypernym of iceboat; that is, vessel is a word with a broader meaning than iceboat:

iceboat: a sailing vessel with runners and a cross-shaped frame; suitable for traveling over ice
vessel: a craft designed for water transportation

Other hypernyms of iceboat include watercraft.

iceboat (noun)	vessel (noun)
a ship with a reinforced bow to break up ice and keep channels open for navigation	a craft designed for water transportation
a sailing vessel with runners and a cross-shaped frame; suitable for traveling over ice	an object used as a container (especially for liquids)
	a tube in which a body fluid circulates