I love * these kind of words:
Moreover, therefore, heretofore, hereto, however, notwithstanding, furthermore, henceforth, wherefore, nonetheless, nevertheless, although, withal, howbeit, albeit, thenceforward, suchlike, so on and so forth...
Many are conjunctions but then there examples like:
Wherewithal, withstand, hereafter...
They are mostly composed of smaller words joined with each other, but personally, I don't think 'breakfast' or 'cupboard', for instance, have the same quality.
What, if any, is the term for this kind of word?
* used sparingly, they're really useful to communicate complex ideas efficiently, but overuse makes you sound a bit like a twat magisterial, or potentially betray a lack self-esteem (or at least awareness) ...
P.S. please feel free to edit and help with tags on this one.