slew vs heap

slew and heap both are nouns.

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

As nouns, slew and heap are synonyms defined as:

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

slew (noun)	heap (noun)
(often followed by `of') a large number or amount or extent	a car that is old and unreliable
	a collection of objects laid on top of each other
	(often followed by `of') a large number or amount or extent

slew (verb)	heap (verb)
turn sharply; change direction abruptly	fill to overflow
move obliquely or sideways, usually in an uncontrolled manner	arrange in stacks
	bestow in large quantities