• zenicus gilviventris,
• cenicus gilviventris,
• denicus gilviventris,
• senicus gilviventris,
• xwnicus gilviventris,
• xsnicus gilviventris,
• xdnicus gilviventris,
• xrnicus gilviventris,
• x4nicus gilviventris,
• x3nicus gilviventris,
• xebicus gilviventris,
• xemicus gilviventris,
• xejicus gilviventris,
• xehicus gilviventris,
• xenucus gilviventris,
• xenjcus gilviventris,
• xenkcus gilviventris,
• xenocus gilviventris,
• xen9cus gilviventris,
• xen8cus gilviventris

The adjective form of "Xenicus Gilviventris" is "xenic".

The plural form of "Xenicus Gilviventris" remains the same. The word is a scientific name, specifically the binomial name of a species of bird known as the South Island Bush Wren. Scientific names do not have a distinct plural form.

The singular form of the word "Xenicus Gilviventris" is "Xenicus Gilviventris" itself. This is because "Xenicus Gilviventris" is already a singular scientific name referring to a specific species of bird known as the South Island bush wren.