One word when you are refering to the term, I have a HEADACHE.
It can be one word, although much more often seen as two words. Older dictionaries show it hyphenated stomach-ache.
you can wear two but you might get a head ache.
The correct spelling is two words, stomach ache (pain, as of indigestion).
No - it's just one word.
Headset, one word.
Generally, it's one word.
This is normally used as a two-word phrase "head count." A few sources show the one-word compound noun "headcount" as a variant. But it does make sense if used in the plural (headcounts)because readers will not mistake it as a noun and verb.
It just be two because it would just look weird as one(headstart) but you could make it one with a hyphen(head-start) that would also look good. It depends on how you are using it. If you use it in a sentence, such as, "I got a head start in the race today," it is written as two words. If you are using it as a company or program name it depends on how they choose to write it.
head teacher school head
One; I lost the other two.
No, "head pond" is not a word it is two words.
Two words - "one day".