is a specific kind of: vein, vena, venous blood vessel.

is a broader term that covers: anterior labial veins, venae labiales anteriores | posterior labial veins, venae labiales posteriores.

is a part of: vulva.

is a specific kind of: vein, vena, venous blood vessel.

is a broader term that covers: inferior labial vein, vena labialis inferior | superior labial vein, vena labialis superior.

is a part of: lip.