The materialistic mindset invented language built around the key notion of objects. Objects are represented by nouns.
In contrast to that, the spiritual mindset or the mind-over-matter mindset came up with the concept of dharma as its primary building block. Dharmas are not nouns because they are not objects. Instead, dharmas are adjectives because they ...
The word "dhamma" has many meanings in the Pali Canon, as seen in this SuttaCentral dictionary entry.
The "dhamma" you are referring to from the Satipatthana Sutta is most likely referring to:
a constituent of experience; an aspect or quality of existence; physical sensation; a mental state or quality (good or bad);
(sometimes merely) ...
Anupassi is watching (by understanding) continuously.
You can translate into many words because when mind arising, there are many mind factors arising together with each mind.
However, according to each Sutta's context, the selected words are the most proper words for that Sutta.
For the example, Anupassi in DN22 MahasatipatthanaSutta.
Anupassi in that Sutta ...