• helplline,
• help-line,
• elpline,
• hepline,
• helplin,
• gelp line,
• belp line,
• nelp line,
• jelp line,
• uelp line,
• yelp line,
• hwlp line,
• hslp line,
• hdlp line,
• hrlp line,
• h4lp line,
• h3lp line,
• hekp line,
• hepp line,
• heop line

The adjective form of the phrase "help line" is "helpful".

The plural form of "help line" is "help lines"

The singular form of the word "help line" is "help line".