Comparative evidence

speḱ

• Lat. haruspex -icis, m. ‘a diviner’ of a class originating in Etruria; acc. Cicero they were interpreters of internal organs, prodigies, and lightning (OLD: 787)

• Lat. speciō -ere, perf. spexī  ‘see’, ‘observe’, ‘watch over’, ‘regard’ (OLD: 1800)

• Lat. auspex -icis, m. ‘a person who gets omens from the flight’, ‘an augur’, ‘a functionary at the wedding ceremony’, ‘patron’, ‘supporter’ (OLD: 218)

References

OLD = Glare, P. G. W. 1968. Oxford Latin Dictionary. Oxford: Clarendon Press.