lump vs intumescency

lump and intumescency both are nouns.

Word	Noun	Adjective	Verb	Adverb
lump	Yes	No	Yes	No
intumescency	Yes	No	No	No

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

lump (noun)	intumescency (noun)
a compact mass	the increase in volume of certain substances when they are heated (often accompanied by release of water)
a large piece of something without definite shape	swelling up with blood or other fluids (as with congestion)
an awkward stupid person
an abnormal protuberance or localized enlargement

lump (verb)	intumescency (verb)
group or chunk together in a certain order or place side by side
put together indiscriminately