mebibyte vs M

mebibyte and M both are nouns.

Word	Noun	Adjective	Verb	Adverb
mebibyte	Yes	No	No	No
M	Yes	No	No	No

As nouns, mebibyte and M are synonyms defined as:

mebibyte and M: a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes

Other synonyms of mebibyte include MB, megabyte, MiB.

mebibyte (noun)	M (noun)
a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes	concentration measured by the number of moles of solute per liter of solution
	the 13th letter of the Roman alphabet
	the cardinal number that is the product of 10 and 100
	a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes
	a unit of information equal to 1000 kilobytes or 10^6 (1,000,000) bytes