How does John Donne use images and form to portray his love as fixed and firm in his poem A Valediction: forbidding mourning?

Which line in this excerpt from "the love song of j. alfred prufrock" by t.s. eliot uses synecdoche? shall i say, i have gone at dusk through narrow streets and watched the smoke that rises from the pipes of lonely men in shirt-sleeves, leaning out of windows? i should have been a pair of ragged claws scuttling across the floors of silent seas.