lamp vs egg candler

lamp and egg candler both are nouns.

Word	Noun	Adjective	Verb	Adverb
lamp	Yes	No	No	No
egg candler	Yes	No	No	No

As nouns, egg candler is a hyponym of lamp; that is, egg candler is a word with a more specific, narrower meaning than lamp:

lamp: an artificial source of visible illumination
egg candler: A light shield that allowes only a spot of light about the size of an egg to shine out; used to test eggs.

lamp (noun)	egg candler (noun)
an artificial source of visible illumination	A light shield that allowes only a spot of light about the size of an egg to shine out; used to test eggs.
a piece of furniture holding one or more electric light bulbs