• untropin,
• jntropin,
• kntropin,
• ontropin,
• 9ntropin,
• 8ntropin,
• ibtropin,
• imtropin,
• ijtropin,
• ihtropin,
• inrropin,
• infropin,
• ingropin,
• inyropin,
• intripin,
• inropin,
• intropyn,
• intropan,
• intropine,
• intropen

• intriguing,
• indri,
• indri indri,
• indrawn,
• intrepid,
• intragroup,
• intro,
• intrinsic,
• intromit,
• in turn,
• intrinsical,
• intron,
• intruding.

The adjective form of "intropin" is "intropic".

The plural form of the word "intropin" is "intropins".

The singular form of the word "intropin" is still "intropin". The word doesn't change when it is singular.