traveller: P. and V. ὁδοιπόρος, ὁ.
stranger: P. and V. ξένος, ὁ, V. ξεῖνος, ὁ.
wanderer: P. and V. πλανήτης, ὁ, πλάνης, ὁ, V. ἀλήτης, ὁ.
