How do you say island in Hindi?
— द्वीप (m) (dvīp); टापू (m) (ṭāpū); द्वीप

Generic synonyms for island in Hindi
earthभूमि (bhūmi)
landभूमि (f) (bhūmi)
Specialized synonyms for island in Hindi
manआदमी (m) (ādmī); मानव (m) (mānav); मनुष्य (m) (manuṣya)