The type of water-filled mattress is one word, waterbed.
The fact that this is flagged by many spell-checkers does not mean that it is incorrect, only that the term has not yet been incorporated into the associated dictionaries. Other two-word terms are "water mattress" or "floatation mattress."
It depends on the context.
"I am going to get some fresh water" is two words.
"This is a Freshwater Fish" is one word.
Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.Its not one word, its actually two words: Pax Romana.
it is two words
No, the word "downstairs" is a single word, not two words.
It's one word.One word as an adjective; two words as a noun
in-house - two words, hyphenated.
Car sick is two words.
It is one word
The word "in between" implies that there are two words on either side of it.
Two words - "one day".
two words
They are two words conjoined to be one.
Two words.