• iet,
• fet,
• cet,
• ez,
• umet,
• rt,
• det,
• epty,
• etf,
• gt,
• ey,
• iget,
• eypt,
• ek,
• uiet,
• emto,
• lt,
• ot,
• eb,
• ext

• etui,
• jet,
• vet,
• wet,
• Ettie,
• pet,
• net,
• Met,
• -let,
• It,
• -er,
• e,
• Etha,
• let,
• get,
• ETD,
• at,
• Etta,
• e-,
• -ed,
• ut,
• wt.,
• T,
• eta,
• etc.,
• bet,
• eat,
• set,
• -ey,
• -est.

The adjective form of "ET" would be "extraterrestrial".

The plural form of "ET" is "ETs"

The singular form of the word "ET" is still "ET" as it is an initialism and does not change in singular form.