I miss a tag like function word. The most difficult words in the dictionary of English and all other languages are function words. The thread "Is this subjunctive?" in ELU concerned with "come+time" has the tags meaning, grammar, subjunctive-mood. That is of the vaguest kind, but no precise labelling.
I find the system how tags are presented very confusing and unsystematic. It is very difficult to see what choices there are as to tags. I think one should consider a new arrangement of the sector tags.