Each spirit has a series of titles that identify them and are used something like a ranking system. They're collected, created and inherited and spirits are very possessive over them, with the more titles theoretically meaning the more power a spirit has.

JACK FROST / SPIRIT OF WINTER
The Winter Prince, Shepherd of the Frost, Snow Caller, The Hiemal King

NICKLY THIZE / SPIRIT OF AUTUMN
Harvest Child, Lord of the Ripened Fields, Bringer of the Horn A'Plenty, Chief of Autumn