M vs mebibyte

M and mebibyte both are nouns.

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

As nouns, M and mebibyte are synonyms defined as:

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

Other synonyms of M include MB, megabyte, MiB.

M (noun)	mebibyte (noun)
concentration measured by the number of moles of solute per liter of solution	a unit of information equal to 1024 kibibytes or 2^20 (1,048,576) bytes
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