Speculation
Noun and する verb
おくそく
人々は、その試合は八百長だったのではないかと憶測している。
People are speculating that the match may have been fixed.
A recollection and measurement of the situation is what I use to make a guess and speculation.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.