systematic vs regular

systematic is not a noun while regular is a noun.

Word	Noun	Adjective	Verb	Adverb
systematic	No	Yes	No	No
regular	Yes	Yes	No	No

systematic (noun)	regular (noun)
	a garment size for persons of average height and weight
	a regular patron
	a dependable follower (especially in party politics)
	a soldier in the regular army

systematic (adjective)	regular (adjective)
characterized by order and planning	in accordance with fixed order or procedure or principle
of or relating to taxonomy	(of solids) having clear dimensions that can be measured; volume can be determined with a suitable geometric formula
	(used of the military) belonging to or engaged in by legitimate army forces
	not constipated
	relating to a person who does something regularly
	officially full-time
	not deviating from what is normal
	regularly scheduled for fixed times
	conforming to a standard or pattern
	occurring at fixed intervals
	symmetrically arranged
	often used as intensifiers
	in accord with regular practice or procedure