(i) Turtledove

(ii) Towr (8449)- a ring-dove, often (figuratively) as a term of endearment:

From a primitive root; to meander (causatively, guide) about, especially for trade or reconnoitring:

See also Dove.

(iii) Activity of the Holy Spirit.

(iv) (a) 2:12

(b) See Dove