• gereinunder,
• bereinunder,
• nereinunder,
• jereinunder,
• uereinunder,
• yereinunder,
• hwreinunder,
• hsreinunder,
• hdreinunder,
• hrreinunder,
• h4reinunder,
• h3reinunder,
• heeeinunder,
• hedeinunder,
• hefeinunder,
• heteinunder,
• he5einunder,
• he4einunder,
• herwinunder,
• hersinunder

• hereunder,
• Herewithin,
• hereinbelow,
• Hereintofore,
• Hereunto,
• hereinafter,
• hereinabove,
• hereinbefore.

The adjective form of the word "hereinunder" is "hereinunder". It is already an adjective form used to describe something mentioned or specified in the document, clause, or section under discussion.

The plural form of the word "hereinunder" is also "hereinunder." It is not a commonly used word and is typically used in legal or formal writing to refer to provisions or statements that appear later in the same document or text. Since it does not frequently appear in a plural context, the plural form remains the same as the singular.

The singular form of the word "hereinunder" is "herein"