You do find the term 'semi-planing' on designers' websites and in official military sites.

An example of semi-planing boats: Along the long Scandinavian coast people developed a vessel type looking like short merchant viking ships with fairly deep keel and rather fat round bow and stern. Fishermen used 20-30 foot boats doing the hull speed: 6-9 knots with ca 20 hp engines.

When glass-fibre reinforced polyesther enabled production of such boats for recreational use, the possibility of modifying hull shape to increase speed immediately become important. The designers changed the aft 1/3 and introduced a horizontal flat bottom section with sharp edge between bottom and sides. Keeping the canoe-shape or cruiser-type stern. The deep keel was kept to preserve sea-worthiness. With double engine power, speed increased by ca 50 %.

Hence creating lift of the stern to prevent the sucktion down at hull speed + a sharp termination of the wet surface to enable the water slipping from the stern, this boat type surpassed its hull speed. The boat is not lifted out of the water more than very few %, bouyancy is than main contributon to floating, but there is dynamic lift of the stern.
This type of boat may be considered in a transition between displacement mode and planing mode. Or one may consider this a system in which part of the boat is planing.
In other words: 'semi-planing'.

Consider this:
Almost all high-performance cats have a transom stern to allow water to detach from the stern. Why?

High-performance cats' sterns are not sucked down when surpassing hull speed. Why?

Stein