11-letter words that end in a
- wonga-wonga — a woody Australian vine, Pandorea pandorana, of the bignonia family, having showy clusters of yellowish-white flowers streaked with purple.
- xanthinuria — An abnormally high level of xanthine in one's urine.
- xenoglossia — an ability claimed by some mediums, clairvoyants, etc, to speak a language with which they are unfamiliar
- xiphisterna — Plural form of xiphisternum.
- yerba buena — an island in San Francisco Bay between Oakland and San Francisco, California: a 500 feet (152 meters) two-story tunnel across this island connects the two spans of the San Francisco–Oakland bridge.
- yorba linda — a city in SW California.
- yoshkar-ola — a city in and the capital of the Mari Autonomous Republic, in the Russian Federation in Europe, NW of Kazan.
- zarathustra — Zoroaster.
- zauschneria — Epilobium canum, a North American willowherb.
- zend-avesta — the Avesta together with the Zend.