Yswr, n. a consumer
Yswydden, n. a privet tree
Yswymbren, n. a quiver
Ysŵyr, n. what dawns; the east
Yswyth, n. what pervades
Yswythbysg, n. the torpedo
Yswytho, v. to pervade
Ysyn, n. a fire brand
Ysywaeth, adv. more the pity
Yth, n. what stretches out: pron. thee, thy