wordnet semantic similarity: how to refer to elements of a pair in a list? can we sort dictionary according to the value?

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Thanks indeed for all your suggestions. When I try my above codes, what puzzles me is that when the data in the dictionary increase, some data become missing in the sorted result. Quite odd. In the pairs, we have {'journey':'voyage'} but in the sorted result no ('journey-voyage',0.25), which did appear in my first post which was a small scale experiment. I am quite puzzled...

>>> pairs = {'car':'automobile', 'gem':'jewel', 'journey':'voyage','boy':'lad','coast':'shore', 'asylum':'madhouse', 'magician':'wizard', 'midday':'noon', 'furnace':'stove', 'food':'fruit', 'bird':'cock', 'bird':'crane', 'tool':'implement', 'brother':'monk', 'lad':'brother', 'crane':'implement', 'journey':'car', 'monk':'oracle', 'cemetery':'woodland', 'food':'rooster', 'coast':'hill', 'forest':'graveyard', 'shore':'woodland', 'monk':'slave', 'coast':'forest','lad':'wizard', 'chord':'smile', 'glass':'magician', 'rooster':'voyage', 'noon':'string'}
>>> list_simi=[]
>>> for key in pairs:
	word1 = wn.synset(str(key) + '.n.01') 
        word2 = wn.synset(str(pairs[key])+'.n.01') 
        similarity = word1.path_similarity(word2) 
        list_simi.append((key+'-'+pairs[key],similarity))

        
>>> from operator import itemgetter

>>> sorted(list_simi, key=itemgetter(1), reverse=True)
[('midday-noon', 1.0), ('car-automobile', 1.0), ('tool-implement', 0.5), ('boy-lad', 0.3333333333333333), ('lad-wizard', 0.2), ('monk-slave', 0.2), ('shore-woodland', 0.2), ('magician-wizard', 0.16666666666666666), ('brother-monk', 0.125), ('asylum-madhouse', 0.125), ('gem-jewel', 0.125), ('cemetery-woodland', 0.1111111111111111), ('bird-crane', 0.1111111111111111), ('glass-magician', 0.1111111111111111), ('crane-implement', 0.1), ('chord-smile', 0.09090909090909091), ('coast-forest', 0.09090909090909091), ('furnace-stove', 0.07692307692307693), ('forest-graveyard', 0.07142857142857142), ('food-rooster', 0.0625), ('noon-string', 0.058823529411764705), ('journey-car', 0.05), ('rooster-voyage', 0.041666666666666664)]