• zstrantia,
• sstrantia,
• wstrantia,
• qstrantia,
• aatrantia,
• aztrantia,
• axtrantia,
• adtrantia,
• aetrantia,
• awtrantia,
• asrantia,
• astrania,
• astranta,
• astranita,
• astrantiaa,
• astrencia,
• astentia,
• astranitia,
• ostrantia,
• astrancia

• astraphobia,
• astral,
• astray,
• astragal,
• astronautics,
• astroglia,
• ashtray,
• astragalar,
• astronautic,
• astronium,
• astronaut,
• astraddle,
• astringent,
• astragalus,
• australia,
• Asteraceae,
• astrakhan,
• australasia,
• australian.

The plural form of the word "astrantia" is "astrantias".

The singular form of the word "astrantia" is "astrantia". The word does not change in form when used in both singular and plural contexts.