noun which may take the genitive case particle 'no', adverb
Indicates an unspecified or indefinite thing, way, or kind. Often used as a no-adjective (何らかの) or adverbially (何らか).
何らかの理由で彼は来なかった。
For some reason he didn't come.
この問題は何らかの形
This problem must be solved in some form.
何か is the common word for 'something', while 何らか is more formal and often used in written or abstract contexts.
Compound of 何 (nan, 'what') + ら (ra, pluralizing/indefinite suffix) + か (ka, interrogative/indefinite particle).