SYMPHONIC POEM = TONE POEM:

Single movement work for orchestra in which a poem or program provides the basis for musical narrative.

The term Symphonic Poem was coined by Franz Liszt.
Richard Strauss preferred the label Tone Poem.
The musical structure is driven by the narrative.
It can be completely formless. If adherent to form, it does so loosely.
PROGRAM MUSIC:

Instrumental composition depicting extra-musical material, or telling a literary story in musical terms. Examples: Beethoven Symphony #6 (Pastoral), Berlioz Symphony Fantastique, Rimsky-Korsakov Scheherazade.