lump vs nugget

lump and nugget both are nouns.

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

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

lump: a large piece of something without definite shape
nugget: a solid lump of a precious metal (especially gold) as found in the earth

Other hyponyms of lump include nodule.

lump (noun)	nugget (noun)
a compact mass	a solid lump of a precious metal (especially gold) as found in the earth
a large piece of something without definite shape
an awkward stupid person
an abnormal protuberance or localized enlargement

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