What's the opposite of 儿化？非儿化？
I cannot think of a term that exactly refers to the version without erization corresponding to the same word with erization.
「非儿化」 refers to the property of the sound:

「头儿」 is 「儿化的 / 儿化音」.
「头」 is 「非儿化的 / 非儿化音」.

「去儿化」 refers to the process in which the erization is removed:
↑ 「去儿化」 is to 「儿化」 as &quot;decentralize&quot; is to &quot;centralize&quot;

「老头儿」去儿化之后得到「老头」。
「老头」是「老头儿」去儿化之后的结果。