Word: tankas
Part of speech: Noun
Syllables: tan
kas
Definition: Plural of tanka; a form of Japanese poetry; the 1st and 3rd lines have five syllables and the 2nd, 4th, and 5th have seven syllables
Morphemes:
Affix: tanka
Language: en
PoS: Noun
Meaning: A form of Japanese verse in five lines of 5, 7, 5, 7, and 7 morae.
Etymology Compounds: Affix: 短歌
Language: ja
Decoded: Duan Ge 
Meaning: tanka
Affix: -s
Language: en
PoS: Suffix
Meaning: Used to form regular plurals of nouns.