I
-some s ə m
▷ — burdensome ˈbɜːd ə n s ə m AmE ˈbɝːd-
▷ — eightsome ˈeɪt s ə m —With this pronunciation, -some forms adjectives or collective numerals: compare the following.
II
-some in biology, 'body' səʊm AmE soʊm zoʊm
▷ — chromosome ˈkrəʊm ə səʊm AmE \ ˈkroʊm ə soʊm -zoʊm —This -some is used with combining forms and means 'body': compare the preceding.