opinion Are "RiverCruise" and "CorporateHealth" keywords good?

Hello,
I did not know how to start the title but it's that time of the year when you have to say bye bye to some bad domain choices.

Specifically.

I saw some River Cruise ads on TV and though there might be some opportunity there.

Of course the best for this tiny niche category would be

RiverCruise.com (owned by Vacations to go)
or
RiverCruises.com (owned by Viking River Cruises)

Is there value in say something below?

keyword+RiverCruise.com
Keyword+RiverCruises.com
or
RiverCruise+Keyword.com


Also, CorporateHealth.com (owned by DomainMarket)

is there any value in keeping domains with set up like below?

Keyword+CorporateHealth.com
CorporateHealth.+Keyword.com

I guess the main question really here is.

"Is there value in three word domains?"

Especially when there is already an industry leader sitting on the 2 word domain version?