raft foundation vs raft

raft foundation and raft both are nouns.

Word	Noun	Adjective	Verb	Adverb
raft foundation	Yes	No	No	No
raft	Yes	No	Yes	No

As nouns, raft foundation and raft are synonyms defined as:

raft foundation and raft: a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete

Other synonyms of raft foundation include mat.

raft foundation (noun)	raft (noun)
a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete	a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers
	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