Cheerful and contented are synonyms for happy.
Some synonyms for singer that start with the letter B are:baritoneballadeer
Righteous
There are no synonyms for late in the English language that begin with the letter Z.
Begin and origin are some synonyms for the word start.
Omphalos, but I don't think it has a standard adjectival form.
Some synonyms for the word "crazy" and begin with the letter d include the following: deranged, dingy, daft, delirious. There are more synonyms in the thesaurus entry listed below.
One word that could mean smart is Logical.
brands, breeds
Some 8 letter words that begin with the letter a:aardvarkabnormalabrasionabsenteeabstractacademicaccuracyactivateactivityadditionadditiveadequacyadherentadhesiveadmonishadvisoryaerationagnosticaircraftallergicalmightyalthoughaluminumambitionamortizeamputateanalogueanalyticannounceannuallyappendixappraiseapprovalaquariumarguablyarmchairasbestosastonishathleticaudienceaviatrix
exaltation
Some clothes that begin with the letter J are:jacketjeansjumper