toilsomeness vs laboriousness

toilsomeness and laboriousness both are nouns.

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

As nouns, toilsomeness and laboriousness are synonyms defined as:

toilsomeness and laboriousness: the quality of requiring extended effort

Other synonyms of toilsomeness include operoseness.

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