As nouns the difference between lab and hem
is that lab
is (astronomy|galaxy) lyman-alpha blob while hem
is an utterance or sound of the voice like "hem", often indicative of hesitation or doubt, sometimes used to call attention or hem
can be (sewing) the border of an article of clothing doubled back and stitched together to finish the edge and prevent it from fraying.
As an interjection hem is
used to fill in the gap of a pause with a vocalized sound.
As a verb hem is
to make the sound expressed by the word hem
; to hesitate in speaking or hem
can be (in sewing
) to make a hem.
As a pronoun hem is