We don't have synonyms for subcontinents yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are subcontinent, subcontinental and sub-continent.
(n) :
A large landmass which is either smaller than a continent (such as Greenland), or part of an even larger continent (such as the Indian subcontinent).
(n) :
Alternative letter-case form of subcontinent (“the Indian subcontinent”). [A large landmass which is either smaller than a continent (such as Greenland), or part of an even larger continent (such as the Indian subcontinent).]
(n) :
A large landmass which is either smaller than a continent (such as Greenland), or part of an even larger continent (such as the Indian subcontinent).
(n) :
Alternative letter-case form of subcontinent (“the Indian subcontinent”). [A large landmass which is either smaller than a continent (such as Greenland), or part of an even larger continent (such as the Indian subcontinent).]