The best replacement for hypercarbia is hypercapnia.

The best alternatives to hypercarbia are rated as following:
★★★★★  hypercapnia
★  hypoxia

Your alternative for hypercarbia is not listed? Suggest!
Speaking about hypercarbia, one probably shouldn't forget about hypoxia.

Other search terms related to hypercarbia and their ratings are:
★★★★★ hypoxia
You have in mind a companion for hypercarbia and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hypercarbia in all years. Click on graph for more.
hypercarbia
hypercapnia
hypoxia