laboriousness vs toilsomeness

laboriousness and toilsomeness both are nouns.

Word	Noun	Adjective	Verb	Adverb
laboriousness	Yes	No	No	No
toilsomeness	Yes	No	No	No

As nouns, laboriousness and toilsomeness are synonyms defined as:

laboriousness and toilsomeness: the quality of requiring extended effort

Other synonyms of laboriousness include operoseness.

laboriousness (noun)	toilsomeness (noun)
the quality of requiring extended effort	the quality of requiring extended effort