• xalendula officinalis,
• valendula officinalis,
• falendula officinalis,
• dalendula officinalis,
• czlendula officinalis,
• cslendula officinalis,
• cwlendula officinalis,
• cqlendula officinalis,
• cakendula officinalis,
• capendula officinalis,
• caoendula officinalis,
• calwndula officinalis,
• calsndula officinalis,
• caldndula officinalis,
• calrndula officinalis,
• cal4ndula officinalis,
• cal3ndula officinalis,
• calebdula officinalis,
• calemdula officinalis,
• calejdula officinalis

The adjective form of "Calendula officinalis" is "calendular".

The plural form of "Calendula Officinalis" is "Calendula Officinalis" as it is already the scientific name of a specific plant species, also known as the pot marigold. In scientific naming, the genus (Calendula) and species (Officinalis) are usually written in italics with only the first letter of the genus capitalized.

The singular form of the word "Calendula Officinalis" is "Calendula Officinalis". The term is already in its singular form as it represents the scientific name of the plant commonly known as marigold or pot marigold.