The Word is:”how”

how

/haʊ/
adverb
adverb: how
1.in what way or manner; by what means.
“how does it work?”
2.used to ask about the condition or quality of something.
“how was your holiday?”
used to ask about someone’s physical or mental state.
“how are the children?”
3.used to ask about the extent or degree of something.
“how old are you?”
used to express a strong feeling such as surprise about the extent of something.
“how kind it was of him”
4.the way in which; that.
“she told us how she had lived out of a suitcase for a week”
in any way in which; however.
“I’ll do business how I like”

Source credit: Google