When looking at the map, it seems that they both mean "bay", but in Finland there are only "luokta" and all "gohppi" are in Norway. The Sami/Norwegian/Finnish dictionary compiled by the Troms university [1] translates both as lahti (“bay”).
Davvisámi-dáru sátnegirji translates them both the same way, with bukt and vik. So I guess they are just synonyms.
