Before you ask, no I don’t think that I can link any of the words in the following list with robots or robotics, although maybe the Czech or Slovak etymology for Robota might link with the same Latin root as Roborant, but I doubt it. Anyway, these are the twenty-four words that have recently been identified as at risk of extinction by the compilers of the Collins English Dictionary.
Abstergent Cleansing or scouring
Agrestic Rural; rustic; unpolished; uncouth
Apodeictic Unquestionably true by virtue of demonstration
Caducity Perishableness; senility
Caliginosity Dimness; darkness
Compossible Possible in coexistence with something else
Embrangle To confuse or entangle
Exuviate To shed (a skin or similar outer covering)
Fatidical Prophetic
Fubsy Short and stout; squat
Griseous Streaked or mixed with grey; somewhat grey
Malison A curse
Mansuetude Gentleness or mildness
Muliebrity The condition of being a woman
Niddering Cowardly
Nitid Bright; glistening
Olid Foul-smelling
Oppugnant Combative, antagonistic or contrary
Periapt A charm or amulet
Recrement Waste matter; refuse; dross
Roborant Tending to fortify or increase strength
Skirr A whirring or grating sound, as of the wings of birds in flight
Vaticinate To foretell; prophesy
Vilipend To treat or regard with contempt
I’m personally working with embrangle and all its derivatives at the moment!