“Synonym measuring” is an English phrase, but it's not a common collocation in typical usage.
“Synonym”
“Synonym” is a noun. It refers to a word or phrase that has the same or nearly the same meaning as another word or phrase in the same language. For example, “happy” and “glad” are synonyms. In a sentence like “You can look up the synonyms of a word in a thesaurus.”, it's clear how it functions as a key element when we talk about words with equivalent meanings.
“Measuring”
“Measuring” is the present participle form of the verb “measure”. The verb “measure” has several meanings. It can mean to find out the size, amount, degree, etc. of something using tools or by making a comparison. For instance, “We are measuring the length of the table.” Here, “measuring” shows the action of determining the length. It can also mean to judge or assess something, like “We measure success by how happy our customers are.”
However, when we put “synonym” and “measuring” together as “synonym measuring”, it's not immediately clear what specific meaning it's intended to convey. It might seem like it could refer to the act of measuring or assessing synonyms in some way, perhaps in a context like a linguistic study where one is analyzing how similar in meaning different synonyms are by certain metrics or in a process of evaluating the frequency or usage differences among synonyms. But generally, it's not an established phrase that people would commonly encounter without further explanation in a specific relevant context.