Here's the poem

Poets make pets of pretty, docile words:

I love smooth words, like gold-enameled fish

Which circle slowly with a silken swish,

And tender ones, like downy-feathered birds:

Words shy and dappled, deep-eyed deer in herds,

Come to my hand, and playful if I wish,

Or purring softly at a silver disk,

Blue Persian kittens, fed on cream and curds.

I love bright words, words up and singing early;

Words that are luminous in the dark, and sing;

Warm lazy words, white cattle under trees;

I love words opalescent, cool, and pearly,

Like midsummer moths, and honied words like bees,

Gilded and sticky, with a little sting.

Is the first line, "Poet's make pets of pretty, docile words" a metaphor?

Thanks!!