reduce vs knock off

reduce and knock off both are verbs.

Word	Noun	Adjective	Verb	Adverb
reduce	No	No	Yes	No
knock off	No	No	Yes	No

As verbs, knock off is a hyponym of reduce; that is, knock off is a word with a more specific, narrower meaning than reduce:

reduce (verb)	knock off (verb)
take off weight	stop pursuing or acting
cut down on; make a reduction in	get rid of (someone who may be a threat) by killing
narrow or limit	write quickly
cook until very little liquid is left	take by theft
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	cut the price of
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