thin vs reduce

thin is an adjective but reduce is not an adjective.

Word	Noun	Adjective	Verb	Adverb
thin	No	Yes	Yes	Yes
reduce	No	No	Yes	No

As verbs, thin and reduce are synonyms defined as:

Other synonyms of thin include melt off, slenderize, slim, slim down.

As verbs, reduce is a hypernym of thin; that is, reduce is a word with a broader meaning than thin:

Other hypernyms of thin include bring down, cut, cut back, cut down, trim, trim back, trim down.

As verbs, thin and reduce are synonyms defined as:

Other synonyms of thin include cut, dilute, thin out.

thin (adjective)	reduce (adjective)
of relatively small extent from one surface to the opposite or in cross section
relatively thin in consistency or low in density; not viscous
lacking excess flesh
(of sound) lacking resonance or volume
not dense
very narrow
lacking spirit or sincere effort
lacking substance or significance

thin (verb)	reduce (verb)
take off weight	take off weight
lose thickness; become thin or thinner	cut down on; make a reduction in
make thin or thinner	narrow or limit
lessen the strength or flavor of a solution or mixture	cook until very little liquid is left
	to remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons
	make smaller
	reduce in size; reduce physically
	make less complex
	reduce in scope while retaining essential elements
	lessen the strength or flavor of a solution or mixture
	be cooked until very little liquid is left
	be the essential element
	destress and thus weaken a sound when pronouncing it
	undergo meiosis
	reposition (a broken bone after surgery) back to its normal site
	lower in grade or rank or force somebody into an undignified situation
	lessen and make more modest
	simplify the form of a mathematical equation of expression by substituting one term for another
	bring to humbler or weaker state or condition
	put down by force or intimidation

thin (adverb)	reduce (adverb)
without viscosity