Looking only a words of 9 letters or more....
INGESTION
INSERTING
INSERTION
NEGATIONS
ORIENTING
ORIGINATE
RATIONING
REASONING
RETAINING
STRAINING
ORIGINATES
There are Several:amentsanearsansateantresapneasaptestaramesarenasarepasarmetsarpensarpentasternatmansattarsenraptentrapmanatsmantasmantesmantramartenmastermatersmatresmattermattesnamersnatterpaeanspaesanparentpartanpasterpatenspatentpaterspattenpatterpraamspratespremanramaterametsratansrattanrattenreatasremansremapsrepastsampansarapesatrapseamansprentstamenstatersternastratastreamtamerstamesttampantampertantrataperstapetatarpantartantastertatarstaterstemptstetrastrampstrapantrapestreatstrepan
Words from the letters "make" include:ammame
There are no complete Englilsh words you can make with the letters MPT.
Some words you can make with 'these letters' are:eelellesteretherheheelherleelesslestletreelresetrestseeseetheseersetsetteesettersettleshesheersheetsleetstreettestthetheethesetreetress
Words that can be spelled with the letters 'curydao' are:aadadoarccadcarcardcaycodcordcoycrudcrycudcurddaydodourdryduooarororcaourracyrayroadrodyardyouyour
Bob letters are words that me did make
The secret word is apartments.
There are no words that contain all of these letters. The longest words you can make have 10 letters (from a total of 12). They are:ScamperingWingspread
Words that can be made from the letters in MAKE are:aammame
Words that can be made with the letters 'simsle' are:elmIisisleleilesslielimememessmilmilemisssisslimslimesmile
Words that can be made with the letters BLEEDS are:bebedbeebleddebedeelledleeseeseedsled
Words that can be made from the letters 'DELETS' are:eeleldestelseledleelestletseeseedsetsledsleetsteedsteeltee