1) Agricultural god 2) Bird genus 3) Fertility god 4) Genus picumnus 
In Roman mythology, Picumnus was a god of fertility, agriculture, matrimony, infants and children. He may have been the same god as Sterquilinus. His brother was Pilumnus. ...[bird] Picumnus is a large genus of piculets. With a total length of 8–10 cm (3–4 in), they are among the smallest birds in the woodpecker family. Species limits in this genus are doubtful, and the rate of interbreeding is `inordinately high` (Remsen et al. 2007). As defined by Winkler and Christie (2002), it contains the 27 species lis...
[n] - a genus of Picidae
genus Picumnus noun a genus of Picidae