Dictionary.com gives these definitions:
camp·ground [kamp-ground] Show IPA
noun
a place for a camp or for a camp meeting.
Origin:
1795–1805, Americanism; camp1 + ground1
Clickcampground
noun
a site where people on holiday can pitch a tent [syn: campsite]
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Wikipedia.org uses this defination for RV park:
A recreational vehicle park (RV park) or caravan park is a place where people with recreational vehicles can stay overnight, or longer, in allotted spaces known as "pitches" ("sites" in North America, Europe, and Australia). They are also referred to as campgrounds, though a true campground also provides facilities for tent camping; many facilities calling themselves "RV parks" also offer tent camping or cabins with limited facilities.
ClickSounds to me the terms are highly interchangeable! But based on definition for campground, a campground is somewhere to pitch a tent. I suppose if the facility can accommodate anything more than a tent, it's then an RV Park.
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Dictionary.com gives this defination for "Resort". It did not have one for "RV Resort", neither did the encyclopedia:
resort
Use Resort in a sentence
re-sort [ree-sawrt] Show IPA
verb (used with object)
to sort or arrange (cards, papers, etc.) again.
Origin:
1885–90; re- + sort
Can be confused: re-sort, resort.
Dictionary.com Unabridged
re·sort [ri-zawrt] Show IPA
verb (used without object)
1.
to have recourse for use, help, or accomplishing something, often as a final available option or resource: to resort to war.
2.
to go, especially frequently or customarily: a beach to which many people resort.
noun
3.
a place to which people frequently or generally go for relaxation or pleasure, especially one providing rest and recreation facilities for vacationers: a popular winter resort.
4.
habitual or general going, as to a place or person.
5.
use of or appeal to some person or thing for aid, satisfaction, service, etc.; resource: to have resort to force; a court of last resort.
6.
a person or thing resorted to for aid, satisfaction, service, etc.
Origin:
1325–75; (v.) Middle English resorten < Old French resortir, equivalent to re- re- + sortir to go out, leave, escape, perhaps ultimately < Latin sort?r? to draw lots, though sense development unclear; (noun) Middle English < Old French ressort, derivative of ressortir
ClickSo the bottom line is, according to the dictionaries and the encyclopedias, there's really not any difference, unless it's truly a "campground" exclusively for tenters, then it's truly a "campground". Everything else is an RV Park or RV Resort (or both).