pilot lamp vs indicator lamp

pilot lamp and indicator lamp both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilot lamp	Yes	No	No	No
indicator lamp	Yes	No	No	No

As nouns, pilot lamp and indicator lamp are synonyms defined as:

pilot lamp and indicator lamp: indicator consisting of a light to indicate whether power is on or a motor is in operation

Other synonyms of pilot lamp include pilot light.

pilot lamp (noun)	indicator lamp (noun)
indicator consisting of a light to indicate whether power is on or a motor is in operation	indicator consisting of a light to indicate whether power is on or a motor is in operation