Difference between Tin Whistle and Pennywhistle

TIN WHISTLE vs PENNYWHISTLE: NOUN

A small, high-pitched whistle that is blown from the end like a flute and is made of metal
An inexpensive fipple flute

A six-holed flute-like instrument with a fipple. They have approximately a two octave range (sometimes a little higher). Stereotypically, they are made out of tin, but in reality they come in all sorts of varieties, including tin, brass, nickel, cane, polymer, etc.
An inexpensive fipple flute, usually having a plastic mouthpiece and a tin body.
An inexpensive fipple flute

Clarinet, Harmonica, Melodeon, Baritone horn, Harp, Dulcimer, Banjo, Bouzouki, Piano accordion, Cittern, Mandolin, Flute, Bodhran, Whistle, Pennywhistle

Dulcimer, Baritone horn, Reed instrument, Bass viol, Melodeon, Harmonica, Bouzouki, Piano accordion, Woodwind instrument, Shawm, Cittern, Bodhran, Flute, Whistle, Tin whistle

Trombone, Saxophone, Bass viol, Woodwind instrument, Clarinet, Harmonica, Baritone horn, Harp, Dulcimer, Piano accordion, Cittern, Mandolin, Flute, Whistle, Pennywhistle

Harp, Xylophone, Mandolin, Dulcimer, Baritone horn, Reed instrument, Bass viol, Harmonica, Piano accordion, Woodwind instrument, Shawm, Cittern, Flute, Whistle, Tin whistle

The air fills with sounds of a fiddle, tin whistle, concertina, and other quaint instruments.
Secondary source materials consist of Matt Broad playing long single notes on his tin whistle.
It is an instrumental with Celtic influences, featuring the violin, bodhran, and tin whistle.
At musica getxo cine wipfrag analysis of a rose irish tin whistle?
The dark island sheet music and tin whistle notes added.
Come All Ye Faithful Tin Whistle Notes and sheet music.
These notes are suitable for a D tin whistle.
Help Falling In Love tin whistle sheet music notes.
Below is another version of the tin whistle notes that I worked out, which is set to be played on a D whistle also.
The tin whistle: The tin whistle or penny whistle is a metallic pipe with six holes.