Syphon rhymes with:
siphon, hyphen, siphon, acetaminophen, altenhofen, carstarphen, dalfen, deafen, dextrathoraphan, dolphin, draffen, entoffen, farfen, geffen, giffen, griffen, griffon, hafen, hanifen, hyphen, ibuprofen, kniffen, lafon, ludwigshafen, mcguffin, mcmuffin, morphin, muffin, offen, often, orphan, paraffin, siphon, sniffen, soften, steffan, steffen, stephan, stiffen, sutphen, tamoxifen, toughen, xenophon
Syphon sounds like:
saban, sabena, sabin, sabina, sabine, sabino, sabunuma, safian, saipan, sapien, sapone, saucepan, savanna, savannah, saviano, savin, savina, savini, savino, savion, savon, savona, saxophone, scavone, schaben, schiavone, schiavoni, schifano, schiffman, schipani, scipione, seven, sevin, shaven, shibanna, shiffman, shipman, shobana, shobanna, shoopman, shubin, sieben, siobhan, siphon, sobin, sobon, sofian, sousaphone, sovine, soybean, spahn, spain, spam, span, spann, spano, spawn, speno, spin, spina, spine, spinney, spino, spiny, spohn, spoon, spun, subhuman, subminimum, subpoena, supan, supine, sven