• inopordum acanthium,
• knopordum acanthium,
• lnopordum acanthium,
• pnopordum acanthium,
• 0nopordum acanthium,
• 9nopordum acanthium,
• obopordum acanthium,
• omopordum acanthium,
• ojopordum acanthium,
• ohopordum acanthium,
• onipordum acanthium,
• onkpordum acanthium,
• onlpordum acanthium,
• onppordum acanthium,
• on0pordum acanthium,
• on9pordum acanthium,
• onooordum acanthium,
• onolordum acanthium,
• ono-ordum acanthium,
• ono0ordum acanthium

The adjective form of the word "Onopordum acanthium" is "Onopordum acanthium" itself, as it is a scientific name for a plant commonly known as the "Scotch thistle" or "cotton thistle". Scientific names do not usually have distinct adjective forms.

The plural form of "Onopordum Acanthium" is "Onopordum Acanthiums".

The singular form of the word "Onopordum Acanthium" is "Onopordum Acanthium" itself. It is the scientific or botanical name of a species of plant commonly known as "Scots thistle" or "cotton thistle".