defect vs glitch

defect and glitch both are nouns.

Word	Noun	Adjective	Verb	Adverb
defect	Yes	No	Yes	No
glitch	Yes	No	Yes	No

As nouns, glitch is a hyponym of defect; that is, glitch is a word with a more specific, narrower meaning than defect:

Other hyponyms of defect include blister, bug, hole.

defect (noun)	glitch (noun)
a mark or flaw that spoils the appearance of something (especially on a person's body)	a fault or defect in a computer program, system, or machine
a failing or deficiency
an imperfection in an object or machine
an imperfection in a bodily system

defect (verb)	glitch (verb)
desert (a cause, a country or an army), often in order to join the opposing cause, country, or army	To suffer a minor malfunction