dishwasher detergent vs dishwashing liquid

dishwasher detergent and dishwashing liquid both are nouns.

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

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

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

Other synonyms of dishwasher detergent include dishwashing detergent.

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