raft vs Kon Tiki

raft and Kon Tiki both are nouns.

Word	Noun	Adjective	Verb	Adverb
raft	Yes	No	Yes	No
Kon Tiki	Yes	No	No	No

As nouns, Kon Tiki is a hyponym of raft; that is, Kon Tiki is a word with a more specific, narrower meaning than raft:

raft: a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers
Kon Tiki: a light raft made of balsa

Other hyponyms of raft include balsa raft, Carling float, life raft.

raft (noun)	Kon Tiki (noun)
a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers	a light raft made of balsa
a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete
(often followed by `of') a large number or amount or extent