LET - To allow to, not to prevent (+ infinitive, but usually without to).
TEE - The name of the Latin script letter T/t.
EEL - Any fish of the order Anguilliformes which are elongated and resemble snakes. There are freshwater and marine species.
REEL - A lively dance of the Highlanders of Scotland; also, the music to the dance; -- often called Scotch reel.
TELL - To count, reckon, or enumerate.
TREE - A large plant, not exactly defined, but typically over four meters in height, a single trunk which grows in girth with age and branches (which also grow in circumference with age).
LEER - A significant side glance; a glance expressive of some passion, as malignity, amorousness, etc.; a sly or lecherous look.
TELLER - A person who tells stories.
RETELL - To tell again, to paraphrase, to tell something one has read or heard.