grain vs milligram

grain and milligram both are nouns.

Word	Noun	Adjective	Verb	Adverb
grain	Yes	No	Yes	No
milligram	Yes	No	No	No

grain (noun)	milligram (noun)
the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric	one thousandth (1/1,000) gram
the physical composition of something (especially with respect to the size and shape of the small constituents of a substance)
the smallest possible unit of anything
foodstuff prepared from the starchy grains of cereal grasses
a relatively small granular particle of a substance
dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn
a cereal grass
1/7000 pound; equals a troy grain or 64.799 milligrams
1/60 dram; equals an avoirdupois grain or 64.799 milligrams
a weight unit used for pearls or diamonds: 50 mg or 1/4 carat
the side of leather from which the hair has been removed

grain (verb)	milligram (verb)
form into grains
become granular
thoroughly work in
paint (a surface) to make it look like stone or wood