photon
bibliophile
biography
photography
philanthropist
philosophy
Philadelphia
biology
biodegradable
photosynthesis
the art, process, or job of taking pictures with a camera; named after the original process that used light to expose an image on special paper.
a US city founded by William Penn, a Quaker who believed in peace
the study of ideas about knowledge, truth, the nature and meaning of life; your personal beliefs or opinions related to life
a person who loves or collects books
the story of a real person's life written by someone other than that person
a tiny particle of light or electromagnetic radiation
a science that deals with things that are alive, such as plants and animals: the study of life
the process by which a green plant turns water and carbon dioxide into food when the plant is expose to light
a wealthy person who gives money and time to help make life better for other people
capable of being slowly destroyed and broken down into very small parts by natural processes, bacteria, etc
