Luktsinne is ’sense of smell’, ’olfactory sense’. Lukt means ‘smell’, a loan from Low German, a sideform to luft, also borrowed from Low German. Luft is ‘air’, in Swedish as well as in German. The original Norse version of the word is lopt, loft, ‘attic’, which has been borrowed into English. A relative is the verb lyfta, English lift (also a Norse loan) Lift has been borrowed into Swedish to mean ‘hitchhiking’, with a new verb, lifta, ‘to hitchhike’.
Sinne is ‘sense’, also borrowed from Low German, Sinn, meaning ‘sense’, ‘thought’ ‘understanding’. It is related to Latin sentire, to feel, from which English sense derives through Old French.