slew vs muckle

slew and muckle both are nouns.

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

As nouns, slew and muckle are synonyms defined as:

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

slew (noun)	muckle (noun)
(often followed by `of') a large number or amount or extent	(often followed by `of') a large number or amount or extent

slew (verb)	muckle (verb)
turn sharply; change direction abruptly
move obliquely or sideways, usually in an uncontrolled manner