Could you share a 'fickle friend'?
Well it'd be interesting to start a list of fickle friends. 
How would you define the term fickle friends? Would it be okay saying words that are synonymous but now always?
The Spanish word arena means sand but also bullring
2 Answers
...those words that look the same or almost the same as English words but have different meanings.
' there also are a number of words that might be called fickle friends, words that are roughly synonymous with English words but have a different connotation, or that are synonymous some of the time but not always.(Although technically not accurate, false friends are often referred to as false cognates. Presumably, that would make fickle friends known as partial cognates.)
To take an extreme example of a fickle friend, one so extreme it is on the list of false friends, look at molestar, which is related to the English verb "to molest." In English, the verb can mean "to bother," which is its Spanish meaning, as in the sentence "they continued on their journey unmolested." But far more often, almost always, the English word has a sexual connotation that is absent in Spanish.'
