flira -fir- gismu

x1 is a/the face [head/body-part] of x2; (adjective:) x1 is facial.

See also sefta, stedu, crane, mebri.

In notes:

crane
x1 is anterior/ahead/forward/(in/on) the front of x2 which faces/in-frame-of-reference x3.
mebri
x1 is a/the brow/forehead [projecting flat/smooth head/body-part] of x2.
sefta
x1 is surface/face [bounded shape/form] of [higher-dimension] object x2, on side x3, edges x4.
stedu
x1 is a/the head [body-part] of x2; [metaphor: uppermost portion].
kevyxejyji'o
k1=xe1=j1 is a cleft/dimple chin of xe2.
molku'o
m1=s1 is a philtrum (infranasal depression) of m2=s2.
nunfirsku
n1 is a facial expression (countenance) of agent f2=c1 expressing f1=c2.
vente
x1 is the ventral part of body x2
sepkili
x1 is a freckle on x2