What is the difference?
- He is not home.
- He is not at home.
Can I use these two phrases interchangeably?
What is the difference?
Can I use these two phrases interchangeably?
Yes, you can. Home is a strange word in that it can be a:
Noun
I was nineteen when I left my home and went to college.
Adjective
They played their first home game of the season.
Adverb
What time did he get home last night?
Or verb
A dozen geese homing to their summer nesting grounds.
"He is not home" uses home as an adverb, while "he is not at home" uses it as a noun.