mainline is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Adjective (NOT COMPARABLE)

Normal, principal or standard.
• Synonym: mainstream
(rail transport) Of or pertaining to the principal route or line of a railway.
(rail transport) Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.

Verb

(slang) To inject (a drug) directly into a vein.
• Synonyms: main
(by extension informal transitive) To consume voraciously.
(computing transitive) To integrate (code, etc.) into the main repository for a software project, rather than separate forks.

Noun (COUNTABLE)

(aviation) An airline's main operating unit, as opposed to codeshares or regional subsidiaries.
(rail transport) The principal route or line of a railway.
• Coordinate terms: trunk line
(fishing) In longline fishing the central line to which the branch lines with baits are attached.

mainline is a Scrabble valid word

mainline

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

mainline is an iScramble, QuickWords valid word

mainline

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• ELIMINAND
• ELIMINANT
• LEMKINIAN
• MAINLINED
• MAINLINER
• MAINLINES
• MELANILIN
• MENINGIAL
• MERLINIAN
• MILLENNIA

Same letters minus one

• ANILINE
• EMILIAN
• LAMININ
• LEMNIAN
• LINEMAN
• MEILANI
• MELANIN