raft vs heap

raft and heap both are nouns.

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

As nouns, raft and heap are synonyms defined as:

raft and heap: (often followed by `of') a large number or amount or extent

raft (noun)	heap (noun)
a flat float (usually made of logs or planks) that can be used for transport or as a platform for swimmers	a car that is old and unreliable
a foundation (usually on soft ground) consisting of an extended layer of reinforced concrete	a collection of objects laid on top of each other
(often followed by `of') a large number or amount or extent	(often followed by `of') a large number or amount or extent