youthful
youthful: adj.
1 young, esp. in appearance or manner.
2 having the characteristics of youth (youthful impatience).
3 having the freshness or vigour of youth (a youthful complexion). øøyouthfully adv. youthfulness n.

yore
yore: n. literary øof yore formerly; in or of old days. [OE geara, geare, etc., adv. forms of uncert. orig.]

yoicks
yoicks: int. (also hoicks) a cry used by fox-hunters to urge on the hounds. [orig. unkn.: cf. hyke call to hounds, HEY(1)]