raft vs raft foundation

raft and raft foundation both are nouns.

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

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

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

Other synonyms of raft include mat.

raft (noun)	raft foundation (noun)
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
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