1. Denoting comparison, and generally placed after a comparative adjective or adverb.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• othen,
• thad,
• tthat,
• thak,
• thenn,
• themn,
• tthank,
• thatan,
• thanh,
• thrn,
• othan,
• thwt,
• bthen,
• thikn,
• thnat,
• thign,
• thtt,
• thenr,
• ethen,
• thanke

• THAM,
• thin,
• Thanh,
• thm,
• thum,
• Thoma,
• thone,
• Thom,
• then,
• Them,
• thon,
• thane,
• Thine.

The plural form of "than" is "thans"

The singular form of the word "than" is "that"