determine availability (and price?) of 50k domains

I have a list of 50k possible domain names. I'd like to find out which ones are available and if possible how much they cost. the list looks like this

presumptuous.lyprincipaliti.esprocrastinat.esproductivene.ssprofessional.lyprofession.allyprofessorshi.psprognosticat.esprohibitioni.st

I've tried whois but that runs way too slow to complete in the next 100 years.

def check_domain(domain):try:    # Get the WHOIS information for the domain    w = whois.whois(domain)    if w.status == "free":        return True    else:        return Falseexcept Exception as e:    print("Error: ", e)    print(domain+" had an issue")    return Falsedef check_available(matches):    print('checking availability')    available=[]    for match in matches:        if(check_domain(match)):            print("found "+match+" available!")            available.append(match)    return available

I've also tried names.com/names bulk upload tool but that doesn't seem to work at all.

How do I determine the availability of these domains?