increase vs accretion

increase and accretion both are nouns.

Word	Noun	Adjective	Verb	Adverb
increase	Yes	No	Yes	No
accretion	Yes	No	No	No

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

increase: a process of becoming larger or longer or more numerous or more important
accretion: an increase by natural growth or addition

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

increase (noun)	accretion (noun)
the act of increasing something	(law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance)
the amount by which something increases	an increase by natural growth or addition
a change resulting in an increase	(geology) an increase in land resulting from alluvial deposits or waterborne sediment
a process of becoming larger or longer or more numerous or more important	(biology) growth by addition as by the adhesion of parts or particles
a quantity that is added	(astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases
	something contributing to growth or increase

increase (verb)	accretion (verb)
become bigger or greater in amount
make bigger or more