dishwashing detergent vs dishwashing liquid

dishwashing detergent and dishwashing liquid both are nouns.

Word	Noun	Adjective	Verb	Adverb
dishwashing detergent	Yes	No	No	No
dishwashing liquid	Yes	No	No	No

As nouns, dishwashing detergent and dishwashing liquid are synonyms defined as:

dishwashing detergent and dishwashing liquid: a low-sudsing detergent designed for use in dishwashers

Other synonyms of dishwashing detergent include dishwasher detergent.

dishwashing detergent (noun)	dishwashing liquid (noun)
a low-sudsing detergent designed for use in dishwashers	a low-sudsing detergent designed for use in dishwashers