I recommend changing the name of the "assessments" tag to "assessment".
I think "assessment" (describes an action) has a very different interpretation than "assessments" (a plural noun describing a thing). "What form of assessment do you use in your class?", vs "What assessments do you use?" I think the latter will be almost universally interpreted as tests/exams. The verb form is much broader and will normally be interpreted as a process. I prefer the verb form (assessment).
Note that there is already a tag for tests and another for exam. Those two should be folded into one tag.
Can it be easily changed? A mod edit: assessments as a tag to assessment? Note that an ordinary user cannot create assessment as it is too close to the existing tag. Mod intervention is needed.
Assessment (the process) can be formative or summative, formal or informal. An assessment answers the question, "what do my students know?"
Tests/quizzes are a specific sort of assessment, involving questions that get answered, often in secured environments, and are traditionally weighted heavily in grading. Assessment generally can be, and sometimes should be, decoupled from grading. The issues is not singular forms v plural forms. That is only an issue if both forms indicate things (i.e. nouns, not processes-verbs).
The current wiki entry (by Buffy) is more aligned with the verb/action form rather than the noun/thing form. Assessment is a process of evaluating the student's work. It need not be via exam.
Note that "assessment" isn't actually a verb, but it is a noun describing an action "to assess". Whereas "assessments" is usually interpreted in education as one particular form of the result of an assessment, but is normally interpreted narrowly.