Words with or without space or - are mostly quite confusing for the readers and writers. Comparing off-site with off site & offsite, or on-site with onsite & on site.
Their formal and informal use is sometimes misleading particularly for those, English is not their first language or mother tongue.
Off-site, offsite or off site?
All three words or spellings (offsite, off site, off-site) are used as adjective and adverb.
meaning
Off-site, off site or offsite means away from the principle area of activity
.
difference
There is no difference although the - or space or no space between off
and site
. Although spellings with - i.e. off-site is more acceptable or recognized whereas spellings without space (i.e. offsite) are less acceptable and having low recognition.
Examples
Off-site grid or off-site operations etc.
Off site grid or off site installation etc.
Offsite grid or offsite visit etc.
On-site, onsite or on site?
All three words or spellings (on-site, onsite, on site) are used as adjective and adverb.
meaning
On-site, on site or offsite means meanings are something happening or going, on or at a particular site or location
difference
On-site grid or on-site installation etc.
On site grid or on site operations etc.
Onsite grid or onsite work etc.
Parts of speech difference
Words with space (off site, on site) are prepositional phrases similar to on top
whereas words without space (off-site, offsite, onsite, on-site) are used as adjective or adverb.
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