• eo,
• enf,
• eeo,
• ael,
• avo,
• ebo,
• eda,
• aev,
• esop,
• aio,
• ayo,
• aom,
• eni,
• aow,
• et,
• etm,
• ezo,
• bep,
• eau,
• beo

• eon,
• o.,
• -er,
• o,
• mo,
• no.,
• -ed,
• -ey,
• mo.,
• ex-,
• e's,
• ego,
• e-,
• e,
• no,
• co-,
• co,
• co..

The adjective form of the word "EO" is "eal".

The plural form of the word "EO" is "EOs"

The singular form of the word "EO" is "EO". The word "EO" does not have a plural form because it is an Esperanto noun that refers to an Esperanto organization or an Esperanto event, rather than being a singular noun with an associated plural form.