letting vs sublease

letting and sublease both are nouns.

Word	Noun	Adjective	Verb	Adverb
letting	Yes	No	No	No
sublease	Yes	No	Yes	No

As nouns, sublease is a hyponym of letting; that is, sublease is a word with a more specific, narrower meaning than letting:

Other hyponyms of letting include car rental, hire car, rent-a-car, self-drive, u-drive, you-drive, sublet.

letting (noun)	sublease (noun)
property that is leased or rented out or let	a lease from one lessee to another

letting (verb)	sublease (verb)
	lease or rent all or part of (a leased or rented property) to another person