massive, mammoth, titanic, monster, honking, hulking
Large, stupendous, gigantic, -- all the words you find on a movie advert. Otherwise, a dictionary of synonyms and antonyms will be a good start, as will be a thesaurus.
No 4 letter words but: VDU Monitor Display All mean computer screen.
Some words (I don't know them all) with the second letter U:aughtautobuckburnbuttercurecutcuteduckdungeondurableeurekaEuropefunnyfurygumballguruhugehumblejumpjuniperjunkkudoskukuiluckyluminousmudmunchmunicipalnumbnumerousnuttyoughtouroutsidepullpunishpurequietquitruggedrumorrushsuddenlysugarsureturnturtletutorZulu
Big, Giant, and colossal are a few examples.
You may be thinking of a dictionary, but all the words in the chapter do not start with the same letter. All the words to be defined do, but the language of the definitions do not.
Nice Mice Mile Mild Meld Mead Mean Hope this helps!
Some 4 letter Christmas words are:treegiftbellwishloveshopsnowsale
Six letter words starting with N:naggednailednapkinnationnaturenectarnearlyneaterneatlyneededneedleneckednegatenervesnestednestleneuternibblenicelynickelniecesnightsnimbleninetynogginnipplenobodynoodlenormalnoticenotionnovelsnovicenozzlenudgednuggetnursesnumbernurishnuzzlenylons
Some 7 letter S words are:salvagesauntersausagesandingscatterscamperscratchscuffleseasicksectionselfishsendingserioussessionshapelyshiftedsharpenshattershackleshakingsharingshimmershowingshuttershovelsshortlyshowersshuttlesickbedsizzledskilledskatingslammerslimmersmudgedsnaggedsnarledsnowmansnowingsnorkelsolvingsoldierspatterspecialspoiledsputterstaffedstaggerstalkerstarvedstammerstapledstationstartlestiffenstoragestressedstretchstingerstringystrikesstumblestutterstylishsubjectsublimesuctionsugaredsummarysupportsupposeswaggersweatersweeperswelterswingerswimmersyringe
letter 'e'
Kick
http://www.scrabble.org.au/words/twos.htm