Principles
I think principal is not right because it doesn’t look right.
The correct answer should beThrough primrose-tufts, in that sweet bower,The periwinkle trail’d its wreathes;
Alliteration is when words in the same sentence begin with the same consonant and here we have "through, tufts, the, that, trail'd" as well as "primrose, periwinkle".
If you gave more detail i could answer this question. if needed
I'm not sure how you would like them classified but,
-2.9 less than -1.5
2.3 greater than -1.5
-1.9 less than -1.5
5.4 greater than -1.5
-3.5 less than-1.5
-.4 greater than -1.5