As a User I want more standard terms instead of `genus`, `species`, `infraspecies`

@Archilegt writes in https://github.com/gnames/gnparser/issues/201

One question: Are "wordType" values open to changes?
For example:
genus to [genericName](https://dwc.tdwg.org/terms/#dwc:genericName)
species to [specificEpithet](https://dwc.tdwg.org/terms/#dwc:specificEpithet)
infraspecies to [infraspecificEpithet](https://dwc.tdwg.org/terms/#dwc:infraspecificEpithet).