If you mean its reading, only kanji can differ when inside a compound word and when alone. Kana [hiragana & katakana] are read the same no matter where they are.
Kanji usually have one or more "on'yomi" [Chinese reading] as well as "kun'yomi" [Japanese reading], it's not a rule but more often on'yomi is used in compound nouns and kun'yomi when the kanji is single.
to be alone mean to have some thing miss inside even if you have many people around you
The Japanese word for alone is 単独 (tandoku)
"Hitori de tabi shiteimasu ka?" would be an informal way of asking "are you travelling alone?" in Japanese.
They had a bomb attack.
alone
"Hitoribocchi."
If she has a boyfriend, leave her alone.
The 'L' does not exist in the Japanese language. Nor does a stand alone 'H'. You would have to rephrase it.
Sashimi
sabishi Kiri is lonely mist because you can't say alone mist
bein alone, loneliness, solitude.
You may say 'itsumo hitoribocchi de imasu.'