• herbey,
• herei,
• herea,
• harely,
• herbery,
• herecy,
• herew,
• wereby,
• heravy,
• heareby,
• therebye,
• hearby,
• neraby,
• hereo,
• herebye,
• heree,
• heref,
• heracy,
• wherebye,
• nereby

• here,
• herb,
• thereby,
• hereof,
• here's.

The adjective form of the word "hereby" is "hereby".

The plural form of "hereby" is "herebys". However, it is not widely used as a plural noun.

The singular form of the word "hereby" is "hereby". It is an adverb and does not change its form in the singular or plural.