1: νῆσος
(Strong's #3520 — Noun Feminine — nesos — nay'-sos )

"an island," occurs in Acts 13:6; 27:26; 28:1,7,9,11; Revelation 1:9; 6:14; 16:20 .

2: νησίον
(Strong's #3519 — Noun Neuter — nesion — nay-see'-on )

a diminutive of No. 1, "a small island," occurs in Acts 27:16 , Cauda, RV.