mainstream is a valid English word

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

Meanings

Adjective (COMPARABLE)

Used or accepted broadly rather than by small portions of a population or market.
• They often carry stories you won't find in the mainstream media.

Noun (COUNTABLE)

The principal current in a flow, such as a river or flow of air
(usually with the) That which is common; the norm.
• ideas outside of the mainstream

Verb

(transitive) To popularize, to normalize, to render mainstream.
(intransitive) To become mainstream.
(transitive education chiefly US) To educate (a disabled student) together with non-disabled students.

mainstream is a Scrabble valid word

m3a1i1n1s1t1r1e1a1m3

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

mainstream is an iScramble, QuickWords valid word

m1a2i3n4s5t6r7e8a9m10

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

Same letters words (Anagrams)

• none

Same letters plus one

• ANTISPAMMER
• DISARMAMENT
• MAINSTREAMS
• MAINSTREAMY
• MARTINMASES
• MATERNALISM
• METROMANIAS

Same letters minus one

• AMRAMITES
• ANIMATERS
• ANTISMEAR
• ARMAMENTS
• EMANATISM
• IMMANATES
• MARINATES
• MARTINMAS
• MASTERMAN
• NATREMIAS