I think that some tags need better names, and want to start out, but will ask here first about opinions and ideas.
Distribution tags should have names ending in -distribution (there might be exceptions like chi-squared which nothing can be done with). So uniform-distribution, pareto-distribution, ... For example, while we have both exponential and exponential-distribution, the shorter name invites misuse (rampant).
online -> online-algorithms (the short name invites misunderstandings)
var -> vector-auto-regression
ensemble -> ensemble-learning
kruskal-wallis -> kruskal-wallis-test (and other similar)
mgf -> moment-generating-function
irt -> item-response-theory
and certainly others ...