Technically speaking, a sublingual tablet would be placed under the tongue to dissolve. An orodispersible tablet would simply be placed on the tongue to dissolve.

the examples of sub-lingual tablets are glyceryl

trinitrate.

The route of administration of Nitrostat is sublingual

Colesevelam

Any water-soluble drug (most often in tablet form)...I used to take benzodiazipines that way (though there's a very unpleasant filler that collects); suboxone (buprenorphine/naloxone [4:1]) is very popular for being administrated via that route.