yams is a form of:

Yam



noun
1.
(the edible starchy tuber of a tropical climbing plant, the plant itself, the sweet potato) ដំឡូងជ្វា
ENGLISH MEANING
noun
1.
A large, esculent, farinaceous tuber of various climbing plants of the genus Dioscorea; also, the plants themselves. Mostly natives of warm climates. The plants have netted-veined, petioled leaves, and pods with three broad wings. The commonest species is D. sativa, but several others are cultivated.
2.
Any one of several cultural varieties of the sweet potato.