S1U1B3S1P3E1C3I1A1L1I1S1E1S1
20 points
SUBSPECIALISES is validvalid
SUBSPECIALISE, to subspecialize [v]
SUBSPECIALISE, to practise a subspecialty, also SUBSPECIALIZE [v]
SUBSPECIALISE, to subspecialize [v]
SUBSPECIALISE, to practise a subspecialty, also SUBSPECIALIZE [v]