In other cases the pronunciation can be ascertained only from the context, as in use, unvoiced for the substantive, voiced for the verb.
There is a basis of reality in the Toltec traditions is shown by the word toltecatl having become among the later Aztecs a substantive signifying an artist or skilled craftsman.
Though, for simplicity and universality of thought, even in science, we must use the abstraction of attributes, and, by the necessity and weakness of language, must signify what are not substances by nouns substantive, we must guard against the over-abstraction of believing that a thing exists as we abstract it.
Amid much that is uncertain and even legendary about his work in Britain, this is plain, that he fixed on the line of Hadrian's wall as his substantive frontier.
The latter on reduction yields a diamino compound, the disulphonic acid of which on diazotization and coupling with a phenol, &c., gives valuable substantive cotton dyes after the type yielded by Benzidine.