Those letters can be used to spell "circulation".
chitterling
combination
questioning
Pumpkin is the fruit you are looking for. It contains 7 letters and begins with the letter P.
Pike is a fish species. It begins with P and contains 4 letters.
Some eleven letter words that start with S are:sacramentalsacrificialsafe-crackersalespersonscholarshipschoolhousescorekeeperscoutmasterscrawninessscrewdriversearchlightsedimentarysegregationselectivityselfishnesssensationalserendipityserviceableseventeenthshallownessshareholdersheepherdershenanigansshinsplintsshipwreckedshirtsleeveshopliftingshortchangeshowmanshipshuttlecocksightseeingsilversmithsingularityskulduggerysleepwalkerslendernesssmithereenssmokescreensmorgasbordsnowboardersocializingsoftheartedsoundlesslysovereigntyspecializedspectacularspeculationspeedometerspendthriftspiritualitysplendorousspreadsheetspringboardstandardizesteamrollersteelworkerstenographystepbrotherstethoscopestimulationstockbrokerstomachachestreetlightsubjunctivesubordinatesubservientsubsistencesubstandardsubstantialsubtractionsuburbanitesufficiencysuffocationsuperchargesuperfluoussuperimposesuperioritysuperlativesupermarketsupervisionsuppositionsuppressantsurvivalistsusceptiblesweepstakessymmetricalsynchronizesyndication
The answer lies in the question. your required word is "seven letter", as it contains eleven letters.
Heroin
The word therein. They are: There I in the here her he rein ere herein and therein.
Herein
Cauliflower is eleven letters.
herein herein
No other letter begins with that letter. The only letter that begins with it is W.
Zoogeographer is a person who studies plants and animals. It begins with z and contains 13 letters.